If you don't want feedback or just a hint you can keep this knob to 9 o'clock. and the looper will act as a simple bypass pedal. Some fuzz pedal start reacting right away at the lowest setting, other pedals, like delays need more feedback to have a pronounced effect. See our demo here on Youtube

You can achieve some interesting effects by using your guitar volume & tone knobs: volume down increases feedback; tone down reduces feedback. See our demo here on Youtube

Audio samples recorded with:

Fender Jazzmaster – Neck pickup

Vox AC30

Shure 57 Microphone

Focusrite 18i20

Nausea

Feedback Looper Phase Inverter

What exactly does a Feedback Looper do? Simply put, it creates feedback and the sound is ingurgitated in a vortex of noise. Plug in your delay pedal, a phaser or a fuzz and let the sound noisy awesomeness consume you.
A Feedback Looper is cool, but we made it even better. We added an expression pedal input so you can control the amount of feedback with your feet. But we also added a phase inverter (that also acts as a booster) to inverts the signal phase so you can use this pedal with with pedals that have reverse phase (e.g. some DBA fuzzes have reverse bias transistors layout so they won't produce any feedback with a regular feedback looper).

How It Works

A feedbacker is essentialy a pedal that creates a loop with your signal and generates feedback. The best pedal to use are delay & reverb pedals but also nice and weird effects can be achieved with fuzz & distortion pedals. A handy phase inverter sweitch on the right side of the pdal helps you when using pedals that invert the signal (think phasers). There is no right or wrong, so we named phase 1 & 2 but is up to you to test it with your own pedal.

Feedback

Controls amount of feedback.

Phase(right side)

Inverts the signal phase, in case of pedals with pahse inverted.

Exp

Expression pedal input, to control the feedback amount with your feet.

The pedal can be battery powered. You may use an external AC Adapter power supply instead of the battery.
Connect the AC Adapter’s plug to the 9V Power Jack or plug a standard 9V battery by removing the screws on the back plate of the pedal.
The power jack’s polarity is center negative.
Do not run at higher voltages or you will risk to burn the components!